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(No Model.) 2 sheetssheen :1.,

J. GILBERT.

SMOKE GONSUMING PURNACE.

No. 397,353. Patented Feb. 5, 1889.

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(No Model.) 2 shets-she`et 2. J. GILBERT.'

SMOKE GONSUMING PURNAGR No. 397,353. Patented Feb. 5, 1889.

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Will? 96661 a /MBW/FW lis a horizontal section of the same, the section lUnire Sterns Arent rricn..

JAMES GILBERT, OF OMAHA, NEBRASKA, ASSIGNOR OF ONE-HALF TO CHARLES E. LEE, OF SAME PLACE.

SMOKE-CONSUIVHNG FURNACE.

SPECFICATION forming part of Letters Patent No. 397,353, dated February 5, 1889.

Serial No. 268,384. iNo model.)

To all whom, t may concern:

Be it known that I, JAMES GiLBnR'r,a citizen of the United States, residing at the city of Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in Smoke-Consuming Furnaces for Boilersand Analogous Purposes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being' had to the accompanying drawings, and to letters or figures of 2 reference marked thereon, which form a part of this specili'cation.

This il'ivention relates to smoke-consuming furnaces for boilers; to a combination with a divided fire-chamber by a central longitudinal partition-wall and with said chambers and alternate-connected combuStien-chamber, an d passing` the gases from the fresh-fed coal in one chamber over the bright lire in the secondary chamber to an additional upward airflue and a supply of heated air from the ashpit to said lire and gases, and to additional air-lues heated in the sidewalls and delivering the same into the combustion-chamber for promoting` combustion, consuming the smoke, and highly heating the furnace and obtaining l superior economy. l

In the annexed drawings, Figure l represents a vertical longitudinal central section of a smoke-consuming furnace applied to a horizontal boiler with a dividing bridge-wall from the boiler-bottom between the fire-box and combustion-chamber, all constructed and provided according to my invention. Fig. 2

taken in a plane indicated by the line a I) -in Fig. l. the same, the section taken at the line c d in Fig. l through the ire-box of the furnace.. Fig. 4 is a similar section taken at the line ef in Fig. l through the bridge-wall of the same.

TheletterA of reference indicates the furnace front wall; A A', the side walls; B, the grates; C, a horizontal tubular boiler; D, the nre-doors on the front plate, E, of the furnace. F represents its iire-boX, G its bridge-wall, l and H its combustion-chamber. By means of the bottom of the boiler.

`combustion -chamber sluit off.

Fig. 3 is a vertical lateral section of a central vertical longitudinal partition-wall, I, from the front to the bridge-wall the common firebox is divided longitudinally into two re-box compartments, J and K, the ash-pits of which are connected by an arch-opening through the base of the wall I in the ash-pit space, so that each said compartments have each a separate lire-door, D, and an opening' in the front wall to feed the coal, and each has a separate grate, B, and the spaces of both compartinents above the grate connect by means of an opening, L, in said wall I at its junction with the front wall, A, and said wall I is built with a luepassage, X, in it, conducting .the air from the rear portion of the ash-pit up into the said wall, then forward, and discharging into the opening L, as shown. Both the bridge and partition-wall I join with The fire-box compartments and the combustion-'Chamber are divided by the bridge-wall, and their connection is cut olf, except through a certain number ot' longitudinal flues or ports, M, made through said bridge-wall for each compartment of the fire-box, as shown, and in said bridge-wall for said ports M of each compartment is made a vertical, lateral, and nearly central space, N, in which for each is employed a vertical sliding tile-damper, O, by means of which said ports of either compartment are readily closed and its connection with the The lower portions of the spaces N are connected, and a central longitudinal rock shaft, P, is employed, with a balance or two-armed lever, Q, Which has a central hub secured firmly upon said shaft, the arms of which project into the relative opposite spaces N, and each is connected with a damper, O, of the relative space by means of aconnecting link or rod, R, to which said arm is pivotcd. V may be constructed of metal, but are preferred of a clay tile secured in a frame, S, of meta-l having a pair of downward eyelids between which said rod R is pivotcd. Said damper and frame are made dat and are guided by vertical metal ways to raise and lower or slide very readily either up to close said ports or down to open them. The inner end of said rock-shaft is guided in a metal bearing, T.

Said dampersfwl roo ' lhe outer end passes through the front wall, and isguided in the Yfront plate, E, and upon its outer extreme end is secured iirnily a hand-lever, l1, for operating the saule. Each side wall, A,of the Vfurnace isbuilt with a longitudinal and vertical air-tine, Y, forconduoting an additional suppl y of heated air foreoinbustion of the gases into the co1nbustion-ehainber. Said air-fines have their entrz1nee"\ for the air at the front of eaeh side, wall, as shown. Froln theentranee each tiuetmsses a portion, Y, horizontaltv into a second portion, descending to a lateral tine, YH,

beyond thebridge-wall and below the bottom ofthe comb11s1ionel1an1l1er, and from there thel air is conducted through a longitudinal portion, Vi', into a 'vertieal portion, Y, 111 the back wall, meeting 111 a eonnnon lateral horizontal portion, V7, of both ilues of the side walls 111 said back wall. liroln said portion YT the air is condueted through a ineet-ing horizontal portion, Y, 111 each side wall forward until meeting the outlet-tine opening lV from said portion YS, into the portion of the conlbustion-chamber close to the rear side of the lgnidge-wall, so that said air is highlyY heated, and 111 that state nieets and supplies the products of combustion and gases 'from the Iirebox at the rear of the bridge-wall 111 the eoinliustion-chamber, whereby a highl vto secure by Letters lzttent, 'is-d eoinplete combustion of all smoke and con1- bustiblc gases takes place 111 said combustion-chamber and the tinal products of conibustion pass through the tubes of the boiler i and an alternate con 11 ected eolnl111stion-eha1nand the resultant heat passes into the water.

The furnace is operated alternately, feeding each tire-box conlpartinent, so that while the 1i re in one box is bright and its dai'nptisr placed down and its ports left open to coinlnunieate with the combustion-ehanlber the other box is supplied with coal, its damper is 1 raised, and its ports sluit oft', as sl1own 111 Figs. 2 and Si. The 'fresh coal 111 this latter tire-boxv co1npartn1ent is allowed to distill, and the resultant products pass from the first tirebox co1npartnnent into the secondary lire-box b v ineans ofthe opening l1 111 their wall I between; and while said products and gases pass through the opening L a supply of heated air is added through the flue X, and all said pro duets pass for combustion over the bright tire, :1nd the resulting products pass into the open ports M, and through theni into the combus- 11on-cl1an1ber, ineeting the additional suppl5r utf airfroin the i111 11'1] 1e11i11gs ,lhereby the 1i nal eoinbustion takes place, as before inentioned. After the coal in said tire-box eon1- partinent last supplied has become bright, said dampers are reversed, and the ports )l in the compartment sh1'1toff are now opened, :1:1 shown in liig. Ll, and the operation of the 111-e Vis reversed. luv the foregoing it will be `served that the resultant gases frein the `l resh coal receive an additional supply of air at the opening L, and in passing over the bright 111-coi` the followintire-box are hi1ly heated, and the greater portion of the gases are brought to a state of combustion. Those not s1'1fiieiently suppl ied with oxygen `for eo1nbustion are thereaftt-r supplied 111 the eo1nl)nation-chaud1er, where a tnal combustion takes place, and the resultant very high heat and the eonsuniljition of all slnoke and eo1nbustiblc gases is obtained.

,For more read)v eonet-ption, l have shown 111 the drawings the entrance of the air-lines V 111 the side walls, A', as entering at a portion of said walls considerably above the grates of the furnace; but 111practicallyconstruct ing the furnace I arrange said entrances V in said walls at a portion lower than the flue ptiutions V4, to provide for the natural draft-current of air lwhen heilig heated to pass either horizontallyorupward and never downward.

I ain aware that alternate-operating dalnpers have been used; but they have not been used .in combination with air-sllppl)Y tlues additional te the supply of airthreugh the grates and entering at a portion lower than the fuelehainber or grates and delivering air 1o the products of combustion 111 the tire-box and also 111 the eoinl)ustionf-ehalnl1er or space be youd the bridge-wall without requiring a powerful draft or arti l'icial blast.

\\'hat1ch1in1 as nrv invention, and desire 1. ln a s111olie-eonsu1ning `furna'ee, the con1- binatio11,with connected Vfuel-eha1nbers by an opening 111 the partitioil-wall between theln ber with said fuelalfhamber for passing the hot gases frein the fresh-supplied fuel-chain ber over the bright tire of the other fuelchamber, o1' an 'upward air-tlue, X, freni a portion below 1 he grates supplying addititnull oxygen to said hot gases while passing the bright tire, and also providing air-ilues V in the side walls of the furnace delivering -air by natural draft at the rear of the bric gewall for furnishing heated air `into the c0111- l111stio11eha1nber to said gases, substantially for pro1n1 ting combustion and the heat of 1he furnace, as herein set forth.

ln a s1nole-eonsun1ing furnace, the eon1 bination, with itscombustion-ehainbtn 1l and alternate connected and s11pplied [fraai-(11111111- bers, of the hot-air t1 u e X for the Yfuel-cl1an1bers supplied indepe1'1dent Yfreni a portion of the furnaee below its gratos, and the air-lines V 111 the furnace-walls, supplied, as set forth, and delivering beyond thel bridge-wall into the eoinl11lstion-ehanlber ll, and the dzlnipers t), arranged 1o slide between the front and Arear of the double-wal led bridge-wall, all eoinbined and within the walls of the furnace.

ln testimony wl11freoflaffix 1115Y signature 111 presence of two witnesses.

JAMES (ilLlSElt'l. \\'i1nesses:

F. D. 31.111111, H. l'oBINsoN.

IIO 

